“Remember Martin Luther’s way of cutting the devil’s head off with his own sword. ‘Oh,’ said the devil to Martin Luther, ‘you are a sinner.’ ‘Yes,’ said Luther, ‘Christ died to save sinners.’ Thus he smote him with his own sword. Hide in this refuge and stay there: ‘In due time Christ died for the ungodly.’ If you stand on that truth, your blasphemous thoughts, which you do not have the strength to drive away, will go away by themselves, for Satan will see that he is achieving nothing by plaguing you with them.”
“That which is necessary to salvation is not continuous thought but a simple reliance upon Jesus. Hold onto this one fact: ‘In due time Christ died for the ungodly.’ This truth will not require you to do any deep research or profound reasoning or convincing argument. There it stands: ‘In due time Christ died for the ungodly.’ Fix your mind on that, and rest there.
“Let this one great, gracious, glorious fact lie in your spirit until it permeates all your thoughts and makes you rejoice even though you are without strength. Rejoice that the Lord Jesus has become your strength and your song—He has become your salvation. According to the Scriptures, it is a revealed fact that in due time Christ died for the ungodly when they were yet without strength. Maybe, you have heard these words hundreds of times, and yet you have never before perceived their meaning. There is a wonderful thing about them. Jesus did not die for our righteousness, but He died for our sins. He did not come to save us because we were worth saving, but because we were utterly worthless, ruined, and undone. He did not come to earth out of any reason that was in us, but solely and only because of the reasons which He took from the depths of His own divine love.
“In due time Jesus died for those whom He describes not as godly but as ungodly, describing them with as hopeless an adjective as He could have selected. Even if you think little, fasten your mind to this truth, for it is fitted to the smallest capacity and is able to cheer the heaviest heart. Let this text lie under your tongue like a sweet morsel till it dissolves into your heart and flavors all your thoughts.”
Charles Spurgeon, All Is Grace, pp.71-72, emphasis mine